SNVSCU3 October 2025 LM5137
PRODMIX
Based on a resistor RCNFG connected from CNFG to AGND, configure the LM5137 as for single-output interleaved operation. As shown in Table 7-4, use 41.2kΩ to disable DRSS and 54.9kΩ or 71.5kΩ to enable DRSS at 5% or 10% frequency spreading, respectively. This setup disables the error amplifier of channel 2 and places the error amplifier in a high impedance state. The controller is then in a primary, secondary configuration, and the SYNCOUT clock is 180° lagging HO2 (or 180° leading HO1).
As shown in Figure 7-8, connect COMP1 to COMP2 and use FB1 to set the output voltage setpoint. Use PG1 as needed and leave PG2 open or tied to GND.
| RCNFG | PRIMARY / SECONDARY | DRSS | INDEPENDENT OR INTERLEAVED OUTPUTS |
|---|---|---|---|
| 41.2kΩ | Primary | OFF | Interleaved |
| 54.9kΩ | Primary | DRSS1 | Interleaved |
| 71.5kΩ | Primary | DRSS2 | Interleaved |